The bird probably left Finland to Denmark. From Denmark to Germany and France.
From France, it entered Spain to Portugal and landed in Morocco. From Morocco, it entered western Sahara to Mauritania and landed in Guinea. Probably, from Guinea, it entered Ghana through the Gulf of Guinea and landed in the Delta region of Nigeria where it met its death………..
This is the major reason why the bird killed at Isoko North Delta state of Nigeria did not choose to settle at the northern part of the country.